Canadian sensation Justin Bieber has praised collaborator Will.i.Am for being more than just a work partner in a series of tweets.

The pair recently worked together on a track called '#ThatPower', which premiered on UK radio last Friday (March 15), and Bieber told his Twitter followers that the Black Eyed Peas superstar is a genuine person, tweeting:

"shoutout to my friend @iamwill. we got #THATPOWER #goodtimes right here. @iamwill is a real friend."

Upon seeing the message, Will.i.Am wrote back and thanked him for such a great time in Spain: "I had fun in barcelona thanks for everything... The video (for '#ThatPower') is going to be crazy fresh...#trust."

Bieber also shared a series of photographs (shown above left and below) of the pair together. Listen to their collaborative offering on '#ThatPower' here: